Effect of the latest revision of ANSI 2530 (AGA No. 3) on the primary orifice metering element
- Daniel Flow Products, Inc., Houston, TX (United States)
Significant improvements in the equations which govern-the measurement of natural gas using orifice meters, have necessitated changes in the primary devices used to gather the data. These changes have been incorporated into the new revision of the API 14.3 Part 2 Third Edition (AGA-3, ANSI 2530) and are detailed in the following discussion. The error in the coefficient of discharge has been reduced by approximately one half when orifice meters (fittings, flanges, etc) conforming to the new revision of the standard are used. These new orifice meters are constructed to much tighter dimensional and configurational requirements than in the past. Orifice meters which do not meet the requirements of Part 2, must have an in-place calibration run to determine the coefficient of discharge curve over the range of Reynolds Number expected. In all cases, presently installed equipment can continue to be used under a grandfather clause. This existing equipment will have higher flow measurement tolerances than equipment that meets the new edition, particularly in line sizes below 10 inches. Also, this existing equipment cannot be used on new installations or relocated.
- OSTI ID:
- 146369
- Report Number(s):
- CONF-950553--
- Country of Publication:
- United States
- Language:
- English
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